Jointly-Owned Facilities (Tables)

12 Months Ended

Dec. 31, 2024

Jointly Owned Utility Plant, Net Ownership Amount [Abstract]

Schedule Of APS's Interests In Jointly-owned Facilities Recorded On The Consolidated Balance Sheets

The following table shows APS’s interests in those jointly-owned facilities recorded on the Consolidated Balance Sheets at December 31, 2024 (dollars in thousands):

	Percent Owned			Plant in Service		Accumulated Depreciation		Construction Work in Progress
Generating facilities:
Palo Verde Units 1 and 3	29.1	%		$	2,010,346	$	1,081,321	$	20,694
Palo Verde Unit 2 (a)	16.8	%		709,414		397,235		9,076
Palo Verde Common	28.0	%	(b)	898,401		366,027		47,962
Palo Verde Sale Leaseback			(a)	351,050		268,494		—
Four Corners Generating Station	63.0	%		1,848,412		705,667		56,226
Cholla Common Facilities (c)	50.5	%		301,035		231,170		1,743
Transmission facilities:
Arizona Nuclear Power Project 500kV System	33.3	%	(b)	134,713		60,174		7,174
Navajo Southern System	24.7	%	(b)	88,528		38,797		626
Palo Verde — Yuma 500kV System	25.5	%	(b)	24,260		8,120		142
Four Corners Switchyards	58.0	%	(b)	84,367		23,886		309
Phoenix — Mead System	17.1	%	(b)	39,788		21,173		330
Palo Verde — Rudd 500kV System	50.0	%		95,785		34,254		1,808
Morgan — Pinnacle Peak System	63.2	%	(b)	117,500		29,013		287
Round Valley System	50.0	%		548		213		—
Palo Verde — Morgan System	87.5	%	(b)	266,547		46,327		208
Hassayampa — North Gila System	80.0	%		154,330		27,739		—
Cholla 500kV Switchyard	85.7	%		8,454		2,859		35
Saguaro 500kV Switchyard	60.0	%		29,850		15,768		101
Kyrene — Knox System	50.0	%		578		349		—
Agua Fria Switchyard	10.0	%		—		—		82

(a)See Note 17.

(b)Weighted-average of interests.

(c)PacifiCorp owns Cholla Unit 4 (see Note 3 for additional information), and APS operated the unit for PacifiCorp.  Cholla Unit 4 was retired on December 24, 2020. The common facilities at Cholla are jointly-owned.